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Never be stranded. If you run out of CO2 just start pumping. This version of the Slim Jim now includes a CO2 cup that converts it into an Ultraflate Pro. Features the intelligent head that automatically detects Presta or Schrader valves and inflates either style without changing anything. Uses 12, 16, 25 gm cartridges or BIG AIR cans. Light action CO2 control button makes precise inflation a snap. Includes 16g cartridge. Take advantage of our special purchase on this great product.